Can you help me find the name of these movies? (No GA inside)

So I'm looking for the name of this movie I saw a long time ago. I can't remember much though. All I know is that it was a sci-fi movie where some people travelled back in time to prehistory. During the time spent there, one of them stomped on a butterfly or something. That caused chaos in the "present" so when they came back, the world was different. I think there were like monsters and stuff and also the world was attacked by some sort of shock waves or something. So the whole point was that if you go back in time, the smallest changes might affect the present/future.

The second movie I'm looking for is not so old, I think. Should be 2010+. I don't think it's like a well-known movie, more like an indie one. It was a sci-fi/romantic movie. It was set in a world where there were two planets connected by a tower. One of the planets was for poor people and the other one for rich and the only option how the people from different planets could meet each other was to work in the tower. And you know, a poor guy fell in love with a rich woman and you know... the typical romance stuff.

Thanks for any ideas :)